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Li-ion is defined as a fragile technology that requires the protector circuit, the Li-ion is used where very high energy density is required and cost is secondary. Li-ion batters are more expensive, however have never experienced memory issues which have affected other battery technologies

Due to the inherent instability of the lithium metal, especially during charging, research shifted to the non-metallic lithium battery using the lithium ions from the chemicals like Lithium-Cobalt Dioxide (LiCoO2 ). Though slightly lower in energy density as compared with the lithium metal, the Li-ion is safe, given certain precautions are met when charging and discharging.